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Actual Problems in Machine Building. 2015. N 2
Materials Science
in Machine Building
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450
APPLICATION OF CALCIUM AND MAGNESIUM CARBONATE TREATMENT
TO IMPROVE PROPERTIES OF INDUSTRIAL ALUMINUM
Popova M.V.
,
D.Sc.(Engineering), Associate Professor, e-mail:
m.popova@rdtc.ruPrudnikov A.N.
,
D.Sc.(Engineering), Associate Professor, e-mail:
a.prudnikov@mail.ruMalyuh M.A.,
PhD applicant
Siberian State Industrial University, 42 Kirov st., Novokuznetsk, 654007, Russian Federation
Abstract
The results of studies of the effect of melt treatment by carbonates of calcium and magnesium as
well as casting crystallization conditions on the temperature coefficient of linear expansion (TCLE)
of aluminum are presented. An effect of subsequent heat treatment on the change of aluminum
thermal expansion is described. It is noted that by choosing an optimal mode of melt treatment and
crystallization it is possible to reduce aluminum A7 thermal expansion at low and medium test
temperatures. Subsequent aging of the treated samples stabilizes TCLE. It is established that melt
treatment by calcium and magnesium carbonates can significantly reduce thermal expansion of
technically pure aluminum to the values characteristic of the alloys Al-11 % Si.
Keywords
aluminum, temperature coefficient of linear expansion, heat treatment, melt, dolomite